Which to use
“who” is a pronoun and “why” is an adverb - they look or sound alike but fill different roles in a sentence.
- #9,100
- “who” frequency rank
- #14,388
- “why” frequency rank
- 23488
- confusion score
Side-by-Side Comparison
| Feature | who | why |
|---|---|---|
| Definition | Qui. | Pourquoi. |
Where the eye mixes who and why
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Visual trap between who and why
These two trip readers on the page rather than in the ear: who is \ˈhu\ while why is \ˈwaɪ\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - o in “who” becomes y in “why”, and the parts of speech differ too (pronoun vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 23488, derived from the frequency rank of both members and their visual similarity.
who is recorded at frequency rank #9,100, classified as apron, pronounced \ˈhu\. why is at rank #14,388, tagged as anadv, pronounced \ˈwaɪ\.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 23488, this pair ranks #352,223 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of who vs why
Shared letters: hw. Private to "who": o. Private to "why": y.
"who" · 3 letters · shape CCV · "why" · 3 letters · shape CCV
Frequently Asked Questions
Can "who" and "why" be used interchangeably?
Which is more common, "who" or "why"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "who" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "why" - compare definitions side by side with the headword page. Word entry
- This pair ranks #352,223 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "who" and "why" also get mixed up with nearby pairs, the highest-scored neighbour is "Wahl vs why". Nearby pair
Confusion rank #352,223 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.